In the event of aquiring a incurable terminal illness, i think i'd go this route-
A few days camping high in the sierras with close friends/a few family members, definately a trip sometime with them, at least those open to the idea, and let them know what my plan is, then wake at dawn one morning, write whats on my mind, and leave a note for them not to come looking for me, and its my wish not to be found, have a formal burial, etc. Then walk off until i find the proper place to plummet to whatever comes next.
I wouldn't want anyone around to see me jump or land, but i would be honest and firm with the people i'm with that its my choice and theres nothing they can do to stop me. I would let them know my intentions, but i don't want anyone to come looking for me, or be there when i jump or hit the ground. No one needs to see that.
All i ask is being able to have good memories/love to share with the people i love most in my last few weeks of life, then just wake up one morning, write down the most honest things i can about myself, my opinions, my loved ones, my appreccaition for them, and why I'm chosing to end my suffering this way. Then walk off into the wilderness alone, and end my life in the most beautiful setting possible.
If i die miserable in some hosptial bed, so be it. But i'm going to make damn sure thats the least likely to happen. Meaning i may get a notarized legal document insisting i be removed, and allowed assisted suicide by someone willing to help, in the way i so choose. Just to have a better chance of it happening if i loose control over being able to do so myself, and provide legal protection to the angels of mercy that choose to help me pass the way i want to pass.
Starvation, shooting myself, overdose on drugs, not my thing. I'd rather jump and return to the crucible that birthed me, and return my physical body to contribute to natural ecological processes. I'd be honored to have my body eaten to feed hungry wild animals, decompose to fertilize the plants/trees in the area, or whatnot.
Just don't put me in a box in the ground that wastes the natural resources that is the flesh of animal meat, its unnatural, perverted, and immoral to me. And i don't want to know some tree was cut down and my family paid thousands of dollars for a materialistic superficial coffin that is everything i hate about our culture, the need to intellectually seperate ourselves from the natural system of ecology. No matter how futile that attempt is.